Portable Fonts not recognized

Portable fonts not recognized by the PortableFirefox v12 I use. When I go to Tools > Options > Content > Fonts & Colors, the only fonts available are the built-in Windows fonts, the portablefonts are not there. I even tried to change the fonts used in the UI with the Theme Font & Size Changer add-on, the same situation also exists - it cannot see the portablefonts. The link https://portableapps.com/support/portable_apps_suite#fonts mentions about defining manually the font paths in some portableapps (yet #comment-184775 has gone away, I couldn't find it), is there a way to manually define font paths for Firefox. I also use PortableThunderbird with the Theme Font & Size Changer add-on, it sees the portablefonts I have. Any solutions?